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b=Ab3QxyUR3AxcfYmJpPAjvqg3xVX9ODRdOtP4JjD+gjlPYMs4aWD0v0tpV2XnmQsxA 0KPdYd02efI42gcXRsCWx2Kb+9opFXjZbR1HUjikV3RjBmXKsyXdtf26St3GlCyMQn RmKtt/ojtBWdmNBJhgfOTqas5pc7ykEsC9TyqD6y0FRFzYkspoz7H9ae32vwWiNMuc QpvU00rqe1EOIbCMApFKFU0rNMpJ+97Z50JxAWaJj8Wiq1a4ef6edn2PCfl4Lzy46m RahxcFpKB5UGFzsNjUTKHQJ+S4Tfs0dgHIK0Sm96MOEKDhw2afVZOUZkuuu7gIWge0 aW83SgnSvz2Dw== From: Leon Romanovsky To: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch Cc: Jake Edge , Jonathan Corbet , Jason Gunthorpe , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Niklas Schnelle , Chuck Lever , Luis Chamberlain , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni , Leon Romanovsky Subject: [PATCH v9 08/24] dma-mapping: add a dma_need_unmap helper Date: Wed, 23 Apr 2025 11:12:59 +0300 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 8B30740006 X-Stat-Signature: cc76cycymexjih5exy48ae4u9n79oxhf X-Rspam-User: X-HE-Tag: 1745396064-855547 X-HE-Meta: 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 DBhKg62x IaklyYhpAS0SUI+w9Pcv5YzSNboE1w7uaiCIi91XDowq38L16bh3pvgyZzoZ9Fnzew1yd84TCkERdhLl7qB5gKrMagkxW2yKgssqtMW0iP0po/kJxDnX7Y7ihh8KDQ/xx1m5rh7P5DYkM9RIjtU+wpSWlt5Uo1cC9WeXs3rajmqB8Pc1TJXfHkCkd8LcnRXYimvH47XAjRLZgaxPM2FmNxXoxtcv0VHiKca6zf/e1pdfMa1vJjG2SJKBvnY027zF0qKa1IybgO36x3ROMMo9qi6cXezDTn9stjAzk X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Christoph Hellwig Add helper that allows a driver to skip calling dma_unmap_* if the DMA layer can guarantee that they are no-nops. Signed-off-by: Christoph Hellwig Tested-by: Jens Axboe Signed-off-by: Leon Romanovsky --- include/linux/dma-mapping.h | 5 +++++ kernel/dma/mapping.c | 18 ++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index a71e110f1e9d..d2f358c5a25d 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -406,6 +406,7 @@ static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { return dma_dev_need_sync(dev) ? __dma_need_sync(dev, dma_addr) : false; } +bool dma_need_unmap(struct device *dev); #else /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ static inline bool dma_dev_need_sync(const struct device *dev) { @@ -431,6 +432,10 @@ static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { return false; } +static inline bool dma_need_unmap(struct device *dev) +{ + return false; +} #endif /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ struct page *dma_alloc_pages(struct device *dev, size_t size, diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index cda127027e48..3c3204ad2839 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -443,6 +443,24 @@ bool __dma_need_sync(struct device *dev, dma_addr_t dma_addr) } EXPORT_SYMBOL_GPL(__dma_need_sync); +/** + * dma_need_unmap - does this device need dma_unmap_* operations + * @dev: device to check + * + * If this function returns %false, drivers can skip calling dma_unmap_* after + * finishing an I/O. This function must be called after all mappings that might + * need to be unmapped have been performed. + */ +bool dma_need_unmap(struct device *dev) +{ + if (!dma_map_direct(dev, get_dma_ops(dev))) + return true; + if (!dev->dma_skip_sync) + return true; + return IS_ENABLED(CONFIG_DMA_API_DEBUG); +} +EXPORT_SYMBOL_GPL(dma_need_unmap); + static void dma_setup_need_sync(struct device *dev) { const struct dma_map_ops *ops = get_dma_ops(dev); -- 2.49.0